What I propose in #401861 is not to turn some kde-extras recommendations
into dependencies, but to create a new package, kde-extras*-typical*.
With such a package, kde-desktop could add kde-extras-typical, and this
would make sure that changes to the typical KDE extragear packages are
taken into account by kde-desktop, without intervention from tasksel
#401861 already suggests adding a few apps such as k3b,
amarok, etc. to kde-extras as "Depends".